The time
taken for onecomplete turn is called one
day.
The side of the Earth which is facing
the Sun is in
daylight,
on the other side it is night.One day is divided equally into
24 hours.
Each hour is divided into 60 minutes, each minute into 60
seconds.

In addition to spinning on its own
axis, the Earth also orbits the Sun.
The time taken for onecompleteorbit is called one year.
In this time, the Earthturns on its
axis365·24
times.
There are 365 days in oneyear.
To account for the extra0·24,every four years an extraday is
added on to the end of February.
This is called a "leap
year".